This thread is so funny... I have been wracking my brain for days, but I can't think of any words that bug me just based on the sound. I do, however, get really bothered when:
1- Someone tries to translate my name, calling me Raquel, Rochelle, Rachelle. It's a NAME, people. It's always Rachel!
2- People misuse common phrases/idioms. I hate when people say, "I could care less," when they really mean to say, "I couldn't care less." If you CAN care less, then you clearly care more than the least amount possible! Others include "bring in the new year" instead of "ring in the new year" and "helpless romantic" instead of "hopeless romantic."